I'm a newbie with drywall techniques and I just bought a new home that has an unfinished garage. The walls are taped, but I'm not sure if there is a layer of mud over the tape. In some places it appears like there is, in others it doesn't. In any case, what steps do I need to take to finish it? Do I sand it smooth like it is before I apply more joint compound? Is it likely that there is a layer of compound over the tape? If so, do I only need to add one coat of compound or two?
Also, if anyone is very good at this and can give me any pointers I would highly appreciate it. I want to avoid the common mistakes that rookies typically make. Also, if you know any tricks that would be great too. Thank you.
Matt